So I made a bootable Windows 7 Ultimate x64 USB because my rig has 8gb ram. Windows 7 Home Premium SP1, bit The times I've tried to create a 64 bit install flash drive on a 32 but system it failed, every time. 23 May Windows 7 Ultimate SP1 bit. SHA1: 36AE90DEFBAD9DEBAEB77A71C Windows and Pro ( Autumn update). 17 May Windows 7 is available in both bit (x86) and bit (x64) editions and has Home Basic, Home Premium, Professional, Ultimate and.